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Another distinguishing feature of the 221K4 is it is the only featherwieght model that has R. Sorry I don't have any definitave information about which colors each of the models were painted. The explanation tells us that: the S was the particular assembly line on which the machine was put together the 8 indicates 1981 the 247 indicates the day of the year (Sept 4) the 053 indicates that it was the 53rd machine built that day.